By now you've figgered out that Dwayne sorta breezes past construction details that most builders have figured out long ago.

But when he perseverates on something like the washout or the incidences or rib edge alignment, it's because it is VERY important for everything from final finish to flight quality and he spends a lot of time perfecting those details now, so he won't be scrambling to correct "ripple" effects later in the build